CN109854957B - Filling method of closed parallel storage tank with low filling rate - Google Patents
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Abstract
The invention discloses a filling method of a closed parallel storage tank with low filling rate. The method comprises the following steps: when propellant is filled, aiming at the characteristics of parallel storage tanks of a low-filling-rate propulsion system, adjusting the parallel storage tanks Tox1 and Tox2 to different back pressures, and acquiring a weighing zero point of the filling amount of the storage tank Tox 2; opening a downstream liquid port self-locking valve LV2 of the storage tank Tox2, and filling the storage tank Tox2 to a preset filling amount; closing a self-locking valve LV2, and acquiring a weighing zero point of the filling quantity of the storage tank Tox 1; opening a downstream liquid port self-locking valve LV1 of the storage tank Tox1, and filling the storage tank Tox1 to a preset filling amount; finally, the charging and discharging valves at the upstream ports of the tanks Tox1 and Tox2 are opened, and the parallel tanks are filled with the extruded helium gas with the preset pressure. The invention realizes the purpose of filling the parallel storage tanks with low filling rate without air release through the air ports.
Description
Technical Field
The invention relates to a spacecraft bipropellant propulsion system technology, in particular to a closed low-filling-rate parallel storage tank filling method which is suitable for filling a satellite propellant of a low-filling-rate parallel storage tank.
Background
The satellite two-component propulsion system uses two propellants of MON-1 (oxidant) and MMH (combustion agent) as working media, and the propulsion system with a parallel storage box structure generally comprises 4 propellant storage boxes, 2 storage boxes contain MON-1, and 2 storage boxes contain MMH. Conventional bipropellant propulsion systems typically require a reservoir fluid port to be filled with propellant and simultaneously vent through a vent to establish a steady fill pressure differential when filling with propellant. And because the saturated vapor pressure of the oxidant is large, a certain amount of oxidant can be discharged through the air port, so that the filling equipment is inaccurate in weighing, and the propellant measurement is generally carried out by means of a satellite mass center table.
However, for certain satellites that do not have on-line weighing measurement adjustments, conventional propellant filling methods will result in an inability to accurately fill the tanks. The initial propellant charge of the tanks affects on the one hand the accuracy of the measurement of the satellite propellant residual quantity and on the other hand the balanced discharge of the parallel tanks. If the initial filling amount difference of the parallel storage tanks is too large, the center of mass of the satellite is deviated, the attitude control of the satellite is seriously influenced, and the service life of the satellite is influenced due to the loss of too much propellant.
Disclosure of Invention
The technical problem solved by the invention is as follows: compared with the prior art, the method for filling the closed low-filling-rate parallel storage tank achieves the purpose of accurately filling the propellant to the propulsion system of the double-component low-filling-rate parallel storage tank structure without an auxiliary weighing means.
The above object of the present invention is achieved by the following technical solutions: a filling method of a closed low-filling-rate parallel storage tank comprises the following steps:
(1) before filling, electronic scales B with the same specification are stacked on the electronic scales A, and then a propellant filling tank is placed on the electronic scales B;
(2) for two tanks Tox1 and Tox2 arranged in parallel in a two-component propulsion system and intended to be filled with the same propellant, the downstream liquid port self-locking valve LV1 of the tank Tox1 is closed first, and the downstream liquid port self-locking valve LV2 of the tank Tox2 is closed; an upstream gas port charging and discharging valve MV1 of the storage tank Tox1 and an upstream gas port charging and discharging valve MV2 of the storage tank Tox2 are connected with a helium charging pipeline of ground charging equipment, and charging and discharging valves MV3 at the downstream of the self-locking valves LV1 and LV2 are connected with a propellant charging pipeline and a vacuum pump of the ground charging equipment; performing air tightness leakage detection on the pipeline screw joint, and closing all pipeline valves after the leakage detection is finished;
(3) carrying out operations of gas filling and gas releasing on the two parallel storage tanks Tox1 and Tox2 through adding and discharging valves MV1 and MV2, and sampling and testing the released gas in the gas releasing process until the testing result meets the testing qualified standard of the released gas; continuing to deflate the two parallel tanks Tox1, Tox2, the pressure of tank Tox1 is adjusted to P1The pressure of the tank Tox2 is adjusted to P2Then the adding and discharging valves MV1 and MV2 are closed;
(4) opening a filling and discharging valve MV3, vacuumizing a filling pipeline, closing MV3, filling propellant into a pipeline between an inlet of a propellant filling pipeline of filling equipment and self-locking valves LV1 and LV2 at the downstream of a parallel storage tank, and recording the mass m of a filling tank in the state1As the zero point of weighing of the filling of tank Tox 2;
(5) opening a charging and discharging valve MV3, then opening a downstream liquid port self-locking valve LV2 of the storage tank Tox2, and filling the storage tank Tox 2; when the mass of the filling tank reaches m2At this time, the self-locking valve LV2 is closed, and the pressure in the tank Tox2 is recorded as P3；
(6) Opening the upstream port charge-discharge valve MV1 of tank Tox1, bleeding air to adjust the back pressure of tank Tox1 to P4Then MV1 is turned off;
(7) opening a downstream liquid port self-locking valve LV1 of the storage tank Tox1, and filling the storage tank Tox 1; when the mass of the filling tank reaches m3When, self-locking valve LV1 is closed;
(8) the parallel storage tanks Tox1 and Tox2 are simultaneously filled with extruded helium with preset pressure from the charging and discharging valves MV1 and MV2, and the balance and stability of the gas filling process are ensured by controlling the valves; when the pressure in the tank reaches the desired value, the charging and discharging valves MV1 and MV2 are closed.
And (3) adopting a bubble leak detection method in the step (2), namely filling helium with 0.6MPa in the pipeline, and observing all connecting points by visual observation, wherein the connecting points are qualified after no bubbles appear in 3 minutes.
The qualified standard of the released gas test in the step (3) is as follows: the purity of helium is more than 99.5 percent, the content of nitrogen is less than or equal to 200ppm, the content of water vapor is less than or equal to 100ppm, and the content of other gases is less than or equal to 80 ppm.
The pressure P of the tank Tox2 in the step (3)2The value range of (A) is 0.1 MPa-0.2 MPa.
The pressure P of the tank Tox1 in the step (3)1The requirements are as follows:
where Δ P is the reverse opening pressure difference of latching valve LV1 and η is the propellant filling rate of tanks Tox1 and Tox 2.
M in the step (5)2The calculation method of (2) is as follows: m is2＝m1-mtox2(ii) a Wherein m istox2A predetermined charge of propellant is provided to tank Tox 2.
Back pressure P of the tank Tox1 in the step (6)4The requirements are as follows: p4<(1-η)×(P3-ΔP)。
M in the step (7)3The determination method of (2) is as follows: m is3＝m2-mtox1(ii) a Wherein m istox1A predetermined charge of propellant is provided to tank Tox 1.
When the mass of the filling tank is monitored and measured in the steps (4), (5) and (7), the measured value is the average value of the reading value of the electronic scale B and the reading value of the electronic scale C, wherein the reading value of the electronic scale A is subtracted by the weight of the electronic scale B; and the difference between the readings of the C and the reading of the electronic scale B in the filling process is not more than 0.5 kg.
The propellant filling eta of the tanks Tox1 and Tox2 is not more than 70%.
Compared with the prior art, the invention has the following beneficial effects:
compared with the prior satellite filling process, the method does not deflate through the air port during filling, the filling amount measurement does not depend on satellite quality measurement, the filling equipment can complete accurate measurement of the propellant filling amount, and the hardware cost is greatly saved;
the parallel storage tanks are independently filled with the propellant, so that the propellant filling amount of a single storage tank can be accurately controlled, the condition that the propellant filling amounts of the parallel storage tanks are different greatly is avoided, and the balance discharge performance of the subsequent on-orbit parallel storage tanks is guaranteed;
the filling method is simple and easy to implement, the filling flow is reasonable, and the filling process is safe and reliable.
Drawings
FIG. 1 is a block diagram of a parallel tank system in an embodiment of the present invention;
FIG. 2 is a flow chart of a closed low fill rate parallel tank filling method in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a block diagram of a parallel tank system in an embodiment of the present invention, and as shown in fig. 1, a typical parallel tank system structure is composed of 2 propellant tanks (Tox1 and Tox2), 3 charge and discharge valves (MV1, MV2, and MV3), 2 pressure sensors (PT1 and PT2), and 2 latching valves (LV1 and LV 2).
The storage boxes Tox1 and Tox2 both comprise an air inlet and an air outlet, the air inlet and the air outlet are positioned at the top, and the liquid inlet and the liquid outlet are positioned at the bottom; an upstream air port of the storage tank Tox1 is provided with a pressure sensor PT1, and a downstream liquid port is provided with a self-locking valve LV 1; an upstream air port of the storage tank Tox2 is provided with a pressure sensor PT2, and a downstream liquid port is provided with a self-locking valve LV 2; one end of the charging and discharging valve MV1 is connected with an upstream air port pipeline of the storage tank Tox1, and the other end of the charging and discharging valve MV1 is connected with a helium gas charging pipeline of external ground charging equipment; one end of the charging and discharging valve MV2 is connected with an upstream air port pipeline of the Tox2 of the storage tank, and the other end of the charging and discharging valve MV2 is connected with a helium gas charging pipeline of external ground charging equipment. The charging and discharging valve MV3 has one end connected to the downstream of the self-locking valves LV1 and LV2 and one end connected to the propellant charging line and vacuum pump of the external ground charging equipment.
Tanks Tox1 and Tox2 are typically surface tension tanks for storing propellant and helium; pressure sensors PT1 and PT2 for measuring the pressure of propellant tanks Tox1 and Tox2, respectively; the charging and discharging valve MV3 is used for charging or discharging propellant tanks Tox1 and Tox2 with propellant and gas; charge and discharge valves MV1 and MV2 were used for helium filling of tanks Tox1 and Tox2, respectively; and the self-locking valves LV1 and LV2 are used for controlling the on-off of liquid ports at the downstream of the tanks Tox1 and Tox2 respectively.
Fig. 2 is a flowchart of a method for filling a closed low-fill-rate parallel tank according to an embodiment of the present invention, the method is based on a system of parallel tanks shown in fig. 1, and referring to fig. 2, the method for filling a closed low-fill-rate parallel tank according to this embodiment may specifically include the following steps:
(1) before filling, electronic scales B with the same specification are stacked on the electronic scales A, and then the propellant filling tank is placed on the electronic scales B.
(2) For two tanks Tox1 and Tox2 arranged in parallel in a two-component propulsion system and expected to be filled with the same propellant, the satellite is powered up first, the downstream liquid port self-locking valve LV1 of the tank Tox1 is closed, and the downstream liquid port self-locking valve LV2 of the tank Tox2 is closed; an upstream gas port charging and discharging valve MV1 of the storage tank Tox1 and an upstream gas port charging and discharging valve MV2 of the storage tank Tox2 are connected with a helium gas charging pipeline of the ground charging equipment, and charging and discharging valves MV3 downstream of the self-locking valves LV1 and LV2 are connected with a propellant charging pipeline and a vacuum pump of the ground charging equipment. Performing air tightness leakage detection on the pipeline screw joint, wherein a bubble leakage detection method is adopted in the leakage detection method, namely helium gas of 0.6MPa is filled in the pipeline, all connection points are observed visually, and the connection points are qualified after no bubbles appear in 3 minutes; and closing all pipeline valves after the leakage detection is finished.
(3) The two parallel storage tanks Tox1 and Tox2 are simultaneously aerated and then deflated through the adding and discharging valves MV1 and MV2, and the deflated gas is sampled and tested in the deflation process until the test result of the sampled gas meets the set index. The qualification standards of the sampled gas are: the purity of helium is more than 99.5 percent, the content of nitrogen is less than or equal to 200ppm, the content of water vapor is less than or equal to 100ppm, and the content of other gases is less than or equal to 80 ppm). Continuing to deflate the tank, the pressure in tank Tox1 is adjusted to P during deflation1The pressure of the tank Tox2 is adjusted to P2The charge and discharge valves MV1, MV2 are then closed. Pressure P of tank Tox2 in general2Taking 0.1 MPa-0.2 MPa. In addition, the pressure of the tank Tox1 needs to satisfy:
wherein Δ P is the reverse opening pressure difference of latching valve LV 1; η is the propellant filling rate of the tanks Tox1 and Tox2, which is not more than 70%.
(3) And (3) opening a vacuum pump, opening a charging and discharging valve MV3 at the downstream of the self-locking valves LV1 and LV2, vacuumizing a pipeline at the downstream of the storage tank and an external liquid pipeline to a set pressure, such as 0.2kPa, and then closing a charging and discharging valve MV 3. Then the pipeline between the inlet of the propellant filling pipeline of the filling device and the downstream liquid port self-locking valves LV1 and LV2 of the parallel storage tanks is filled with the propellant. Recording the readings of C and B, if the difference is not more than 0.5kg, C represents the value of A reading minus the weight of B, recording the average value of C and B readings as the filling tank mass m1And serves as a weighing zero for the amount filled in the tank Tox 2.
When the mass of the filling tank is monitored and measured in the steps (4), (5) and (7), the measured value is the average value of the reading value of the electronic scale B and the reading value of the electronic scale C, wherein the reading value of the electronic scale A is subtracted by the weight of the electronic scale B;
(4) the charging and discharging valve MV3 is opened, and then the liquid port self-locking valve LV2 at the downstream of the storage tank Tox2 is opened to charge the storage tank Tox 2. According to the requirement of the allowed filling flow control of the used storage tank, filling is carried out in a split flow stage (for example, when an oxidant is filled into a certain plate type storage tank, the filling flow is set to be not more than 1.4kg/min before liquid submerges a storage tank management device, and the filling flow is set to be not more than 4kg/min after the liquid submerges the storage tank management device). The change of the filling flow in the filling process is monitored, and the pressure of the filling tank can be controlled to finely adjust the filling flow. Monitoring the reading of the electronic scale in real time, and if the difference between the readings of C and B is not more than 0.5kg, and the mass of the filling tank (i.e. the average value of the readings of C and B) reaches m2At this time, the self-locking valve LV2 is closed, and the pressure in the tank Tox2 is recorded as P3. Mass m of the filling tank2The calculation formula of (2) is as follows: m is2＝m1-mtox2Wherein m istox2A predetermined charge of propellant is provided to tank Tox 2.
(5) Opening the upstream port charge-discharge valve MV1 of tank Tox1, bleeding air to adjust the back pressure of tank Tox1 to P4And then close MV 1. Wherein the back pressure P of the tank Tox14The requirements are as follows: p4<(1-η)×(P3-ΔP)。
(6) The tank Tox1 is filled by opening the downstream port self-locking valve LV1 of the tank Tox 1. Monitoring the reading of the electronic scale in real time, and if the difference between the readings of C and B is not more than 0.5kg, and the mass of the filling tank (i.e. the average value of the readings of C and B) reaches m3When so, the latching valve LV1 is closed. Mass m of the filling tank3The calculation method of (2) is as follows: m is3＝m2-mtox1Wherein m istox1A predetermined charge of propellant is provided to tank Tox 1.
(7) The parallel storage tanks Tox1 and Tox2 are simultaneously filled with extruded helium with preset pressure from the charging and discharging valves MV1 and MV2, and the gas filling speed is maintained within a certain range by controlling related valves, so that the balance and stability of the gas filling process are ensured. When the pressure in the tank reaches the required value (e.g. 1.7MPa), the charging and discharging valves MV1 and MV2 are closed.
The invention has been successfully applied in launching field priming. A satellite propulsion system adopts two oxidant storage tanks and two combustion agent storage tanks, and the same propellant storage tank is used in parallel. The amount of the oxidizer tank alone was 187kg, the amount of the combustion agent tank alone was 113kg, and the propellant filling rate of the tank was 42.5%. The whole filling process is implemented one by one according to the filling design, and the filling amount of the propellant is monitored in real time. In the filling process, the average filling rate of the oxidant is 3.4kg/min, and the average filling rate of the combustion agent is 2.4 kg/min. Finally, each storage tank is filled to a preset propellant amount, and the error is less than 0.1Kg, thereby indicating that the method is feasible.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A filling method of a closed parallel storage tank with low filling rate is characterized by comprising the following steps:
(1) before filling, electronic scales B with the same specification are stacked on the electronic scales A, and then a propellant filling tank is placed on the electronic scales B;
(2) for two tanks Tox1 and Tox2 arranged in parallel in a two-component propulsion system and intended to be filled with the same propellant, the downstream liquid port self-locking valve LV1 of the tank Tox1 is closed first, and the downstream liquid port self-locking valve LV2 of the tank Tox2 is closed; an upstream gas port charging and discharging valve MV1 of the storage tank Tox1 and an upstream gas port charging and discharging valve MV2 of the storage tank Tox2 are connected with a helium charging pipeline of ground charging equipment, and charging and discharging valves MV3 at the downstream of the self-locking valves LV1 and LV2 are connected with a propellant charging pipeline and a vacuum pump of the ground charging equipment; performing air tightness leakage detection on the pipeline screw joint, and closing all pipeline valves after the leakage detection is finished;
(3) carrying out operations of gas filling and gas releasing on the two parallel storage tanks Tox1 and Tox2 through adding and discharging valves MV1 and MV2, and sampling and testing the released gas in the gas releasing process until the testing result meets the testing qualified standard of the released gas; continuing to deflate the two parallel tanks Tox1, Tox2, the pressure of tank Tox1 is adjusted to P1The pressure of the tank Tox2 is adjusted to P2Then the adding and discharging valves MV1 and MV2 are closed;
(4) opening a filling and discharging valve MV3, vacuumizing a filling pipeline, closing MV3, filling propellant into a pipeline between an inlet of a propellant filling pipeline of filling equipment and self-locking valves LV1 and LV2 at the downstream of a parallel storage tank, and recording the mass m of a filling tank in the state1As the zero point of weighing of the filling of tank Tox 2;
(5) the charging and discharging valve MV3 is opened, then the downstream liquid port self-locking valve LV2 of the storage tank Tox2 is opened, and the storage tank Tox2 is subjected toFilling; when the mass of the filling tank reaches m2At this time, the self-locking valve LV2 is closed, and the pressure in the tank Tox2 is recorded as P3；
(6) Opening the upstream port charge-discharge valve MV1 of tank Tox1, bleeding air to adjust the back pressure of tank Tox1 to P4Then MV1 is turned off;
(7) opening a downstream liquid port self-locking valve LV1 of the storage tank Tox1, and filling the storage tank Tox 1; when the mass of the filling tank reaches m3When, self-locking valve LV1 is closed;
(8) the parallel storage tanks Tox1 and Tox2 are simultaneously filled with extruded helium with preset pressure from the charging and discharging valves MV1 and MV2, and the balance and stability of the gas filling process are ensured by controlling the valves; when the pressure in the storage tank reaches a required value, closing the charging and discharging valves MV1 and MV 2;
the pressure P of the tank Tox2 in the step (3)2The value range of (A) is 0.1 MPa-0.2 MPa;
the pressure P of the tank Tox1 in the step (3)1The requirements are as follows:
wherein Δ P is the reverse opening pressure difference of the latching valve LV1, η is the propellant filling rate of the tank Tox1 and Tox 2;
back pressure P of the tank Tox1 in the step (6)4The requirements are as follows: p4<(1-η)×(P3-ΔP)；
The propellant filling eta of the tanks Tox1 and Tox2 is not more than 70%.
2. A closed, low-fill-rate parallel tank filling method as claimed in claim 1, wherein: and (3) adopting a bubble leak detection method in the step (2), namely filling helium with 0.6MPa in the pipeline, and observing all connecting points by visual observation, wherein the connecting points are qualified after no bubbles appear in 3 minutes.
3. A closed, low-fill-rate parallel tank filling method as claimed in claim 1, wherein: the qualified standard of the released gas test in the step (3) is as follows: the purity of helium is more than 99.5 percent, the content of nitrogen is less than or equal to 200ppm, the content of water vapor is less than or equal to 100ppm, and the content of other gases is less than or equal to 80 ppm.
4. The closed, low-fill-rate parallel tank filling method of claim 1, wherein m in step (5)2The calculation method of (2) is as follows: m is2＝m1-mtox2(ii) a Wherein m istox2A predetermined charge of propellant is provided to tank Tox 2.
5. The closed, low-fill-rate parallel tank filling method of claim 1, wherein m in step (7)3The determination method of (2) is as follows: m is3＝m2-mtox1(ii) a Wherein m istox1A predetermined charge of propellant is provided to tank Tox 1.
6. A closed, low-fill-rate parallel tank filling method as claimed in claim 1, wherein: when the mass of the filling tank is monitored and measured in the steps (4), (5) and (7), the measured value is the average value of the reading value of the electronic scale B and the reading value of the electronic scale C, wherein the reading value of the electronic scale A is subtracted by the weight of the electronic scale B; and the difference between the readings of the C and the reading of the electronic scale B in the filling process is not more than 0.5 kg.
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| CN103033315B (en) * | 2012-12-26 | 2015-07-08 | 北京控制工程研究所 | Simple and efficient tank parallel- balance emission test system and method |
| CN103213692B (en) * | 2013-04-09 | 2015-05-27 | 北京控制工程研究所 | Method of actively adjusting balanced discharging of parallel connection tanks of satellite two component propelling system |
| CN203269530U (en) * | 2013-04-11 | 2013-11-06 | 西安航天动力试验技术研究所 | Integrated quantitative propellant filling and discharging device |
| CN103542258B (en) * | 2013-10-18 | 2015-11-11 | 北京航天发射技术研究所 | High-precision liquid Propellant Loading System combined basis weight device |
| CN203745065U (en) * | 2013-12-23 | 2014-07-30 | 北京长峰金鼎科技有限公司 | Synchronous check scale |
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